Lock-operated circuit-closer



W. B. GARRETTAND H. M. HOFFMAN.

LOCK, OPERATED CIRCUIT CLOSER.

APPLICATION man FEB. 7 I919.

1,346,087, Patented July 6, 192() 2 suns-sugar 1. l. I

i A? I gvwemtow WM 6154 W arfizzaiu W. B. GARRETT AND H. M, HOFFMAN.

LOCK OPERATED CIRCUIT CLOSER.

APPLICATKON HLEQ FEB. 7. I919.

Patented July 6, 1920.

2 SHEETS-SHEET 2.

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WALTER B. GARRETT AND HARRY M. HOFFMAN. OF CARUTHERSVILLE. MISSOURI LOCK-OPERATED CIRCUIT-CLOSER.

intranet:

Specification of Letters Patent.

atented J My (i, 1920.

Application filed February 7. 1919. Serial No 275,627.

lie it known that we. YAL'JEI; l3. GAlUH-L'I'T and llrklili'i' Eli llorriiax, citizens of the lfnited tatcs. residing at taruthersville, in the county oi leiniscot and State of Missouri. have invented new and useful Improvements in laick-Uperated Circuit (losers, ot which-the following is a speeili cation.

The object of the invention is to provide a simple.apparatus applicable especially to a hotel room door and designed primarily to indicate to the attendants in the hotel that a room occupieth and that the occupant d not wish to be disturbed. known fact to those who have frequent occasion to occupy hotel rooms that their work or rest is disturbed by the frequent attempts of the attendants to enter the room for the purpose of cleaning or restoring to condition for further occupancy, and thatthese attempts are made notwithstanding the fact that the key of the occupant may be in the key hole at the inner side of the door, and it is with a view to giving a positive notice to such attendants that the room is occupied that the present device is designed.

A turther objectmr' the invention is to provid an apparatus for the pur 'ioseindicated which may be applied ii'icoiispicuously to a door and under such conditions that it is operative only when the door is closed and the key oi the occupant is inserted in the lock from the inside of the door. to the end that attendants may gain access in the ordiiiary way to the room as in the ordinary practice. when the latter is not occupied or when the occupant has no objection to such entrance.

Further objects and advantages will appear hereinafter iii the. course of the followiiig description. it being understood that changes in form. proportion and details may .bc resorted to within the scope of the appended claims without departing from the spirit oi" the invention. in thc drawing:

Figure l is a view of the door having an attachnwnl' embodying the invention applied thereto in the operative position and shown mainly in dotted lines to indicate its location and those of the connections necessary to its eii'ective operation Fig. is an enlarged view of the mechanism proper showing a key in plat-c to close the circuit.

It is a well 1 ig ll is a transverse sectional view on the plane indicated by the line i'-liof Fig. 12.

Pig. l is a detail view of the main irame plate adapted to be located beneath the escutcheo i plate attached to the door.

1 1g. o is a detail view of one of the contact plates,

l ig. (i is a diagram of the circuits. 11;! i is a section on the line i-7 0t l]"'. 2.

lhe device consists essentially ot contact plates 10 and 11 which in this instance are shown as slid-able members with their terminals mounted in guides 12 which are upstruck from a base plate 13 of such size and proportions as to be arranged beneath the ordinary escutcheon plate of a door lock. These contact plates are yieldinglyheld in their normal positions by springs left which are disposed between ears 15 also preferably lip-struck from the base plate and ears 1.6 lip-struck from the cont-actplates, the tenden y of the springsbcing to inove'the con tact plates inwardly or toward the key hole 17. ('onnected with binding posts 18 on the contact plates are the conductor wires 19 which may be extended in sealed positions through the panels or frame of the door and teirminate in contact buttons 20 for engagenientwitl'i contact plates 21 in the door 't'rameathese contact plates being in turn in circuit with service wires or conductors 22. Also in circuit with the contact plates is an incandescent light bulb QBwvhich may be located in any convenient position on the door as above the lock or handle.

At their inner edges the contact plates are beveled or rounded as shown at 24 and are normally out of contact but in the path of a key inserted through the key hole. As a key is inserted. the apparatus being located under the inside 'escutcheon of the door. these contact plates are separated, and upon their return due to the action of their sprin s. they engage-the shank of the key and thus complete the circuit which is evidenced by the signal light. Obviously upon the withdrawal of the key the circuit ispm'po and c'un urt 5mg. 0f 1 us form the i CESS&L1' w (m of nmnllfuct'ure a 10010 puims of vontuct for t ope "(lied cil'cuit cinsm' for hotel doom m 30 is two-fold. In the coustructlon 15 thereby the 131 having a base phato adapted phwcmeni under the escutcheon plate 01:1.

m1 second the device can be H hence. 10m and pruvik "l with udes cont smizable foz' ms-ungamcn s si1 :l' y m4 antes In has 2:

fact 9f the iic-n' am; as the escutchmm 'p'izte c and does not in j uppezuunce 0f {he a "*Nhat is claimed 1. As :11": a upwn'iml 131 likQ h mngement 11110 dour husk and. herring 1 bindin posts or ci'ukuuit W V said plates jorming circuit h 3 and having & efiected guiding:

dispused inubzsm'umy *lntiun with .110 may hole 01 the dam 10 and manhunt phxtes bfii'flg}; with upsn' 21ml hu' mvoi n the ears. 0n U1 the as. 01

fies, amp

tact plates slidzzbiy mounte in saw 7 and n-ended wlth bmdmg ,pusts for n:

wire mmn I 7/ cult iermmais; 0nd 

